Albert w



A. w. MITCHELL.

SNAP GAGE.

APPLICATION FILED Nov.2,191e.

1 ,3 1 4,888 Patented Sept. 2, 1919.

135 it kn'bwirtliat I, ALBERT W. LIITQHELL,

fthe inner insteadof head.

,1 ma t-m ALBERT W. MITCHELL, OFNEW HAVEN, CONNECTICUT, ASSIGNOR T0'WINCHES'QER T nnrne rmehn viscm, tor nnwznnvnn, connnc'rrcum, A,COREOBATION.M

SNAP-GAGE.

1,314,888 Specification of Letters Patent. I Application mea t e t r2,1e s. Seria1No.2 60,7 8 8.

To all h o mjt maypo'ncera:

a di tijzeii of United States, 'residing at New Haven, in the county ofNew Haven and State offconnecticut, havefinyented a new anduseful"lmprovement "infisnap- Gages; and I dohereby declare thefollowing, whe 'ntdlxen in connection wlth the ace 'mpanyingdrawingshn'dthe characters of "reference marked there n, to'be a full,clear,

and exact "descriptionof the" same, and

Wt eh ai d ew he eeet wt e ja p pl catiomjand represent,

migure "-1 a view partly in ele vation, and partly "n sectio'n, of "asnap gage embodying myinvent ion.

;' Fig. 2a view tliereoftin left hand end i r 1 .JH. A 1 jFigQ3 acorresponding view in right hand end elevation. "'i planview of theadiest 'b tee er n -Pin 3 ig. '5 an endir iew thereof. I Fig. ,6adeta'chedviefw of the jam screw l r,br g h f l u i i i 1 Fig. 7 acorresponding yiew of the adju ng sc ew it el n, ai l saseeeg edgeg neof the weld a Inodi said head f and Fig. 14 is a corresponding viewthereof in inside elevation and Fig. 151isga view in elevation of one ofthe modified forms which the frame of the "gage may My liny e 'enassume.

relates to an mproved the measurement, and to preventing a ile- '1 corepandihe ew ,o th ep" pin of the r WhlCh the plug is of which projectsplied Without danger to a rotating piece,'to

being sealed so that it cannot be tampered *with by the workman afterbeingadjusted, to providing for the exterior indication of y the sprlnging of the frame by forcingthe gage on the work.

With these ends in view, my invention consists in a snap gage havincertain details of construction"and conibinations of parts as will behereinafter described and "pointed out in the claimsj In carrying out myinvention as herein shown, I employ a substantially U-shaped frame 2having stifiening ribs 3, 1 and 5, and terminating at its ends inopposed alined cylindrical alined cylindrical plug-holes 8 and 9.

' The said hole 8 recelvesa normally fixed, but adju stable,measuring-plug 1O theinner end "of which proJcts beyond the inner face'11 of the head 6, and the outer end of which hasan axial screw-hole 12countersunk as at 1 3." The outer end of the said plug is also formedwith four radially arranged "slots 14 to permit it to be expanded by thetapering head 15 of the jam screw 16 by firmly fixed in place after ithas been adjustedby means of a short adjusting-screw 17 for which theouter end of the hole 8is threaded." After the screw 17.has' beenadjusted, it may be, and by sealed in'place by a sealing vthus 1providing against any the 'gage 'by workman preference is, war: seal 18,tampering with after it has been set.

The plug-hole 9 in the head 7 receives a yielding measuring-plug 19 theinner end beyond the inner :face 20 of the head 7 and the outer end ofwhich has bearing in the reduced outer end 21 of the hole 9; A helicalspring 22 encircling the stem 21 is interposed between the shoulder 23of the plug and a shoulder 24: formed at the outer end of themam portionof the Patented Sept. 2, 1919. a

heads 6 and 7 having through the frame 2 enters a cut 26 in the adapt itto enter ajgnarrowj slot;v l'lhese plug 19, this cutbei'ng adapted inwidth figures willlsufliciently serve to illustratetwo to permit therequired longitudinal play of of the manifold forms which the gagingends th l Th te fiface 27 of 1the5he'a'd 7f ofithe vplugs;mayassume;v.If,.'-desired,-Fthe is I provided with a i-tolerance step. '28 thetolerance-step may befOrmedasatBQ upon depth of which ispreciselypredetermined the inner face of'the head 7 mounting the to express thetolerance of thegage. yielding plug 19 the inner end of whi'chis In,using my improved gage, the plug 8 7 reduced by cutting its upper faceaway'as at is set, as required, by means of the adjust- "31 so as toform at its inner end -a shoulder ing-screw 17 which is then removed for32 which cooperates with the tep 30 in using access to the jam-screw 16'which'is now the gage. r c Y turned to, spread the outer .end' of theplug In case it is desired touse-thegage for c and so firmly clam-p itposition, The measuringirregularshapes,theheads sand; adjusting-screw isnow returned to its place 7 will be suitablyfopposed, as sho'wngin Fig;and preferably sealed therein by means of 15,1'atherfthanalineid,"as'shown iilFig; I,

a seal of sealing wax, thus; preventing actheconstruction and operation.of 'the gage, gcess-to the adjusting-screw except as the remainingotherwise unchanged."

wax is broken. 7 After the plug hasbeenset I claim: I i as described,the device is ready for use, :If .1. In a snapg'age,theicombinationwitha when the-gage ispressed against the work, substantially U- shapedframeproyidedwith no the yielding; plug 19 is pushed outward twonopposedheads. having plug holes' ofia; againStthe-tension of the spring22 so that normally fiiiedj iadjustable ine'asur'i'iifgplug its reducedstem 21 projects beyondjlthe mountedinone ofi the' saidheads, andfa;tolerance step 28, then; the objectbeing yielding measuring plug mountedin lthe gaged is rejected asexceeding the maximum other theheadreceiving l he said, yielding allowable demensions. If, on thekotherplugberg formed .at, one'end with jer hand, the outer end of the stem 20jfalls ance-step. ff j within the plane of the inner end of thestep, 2.Ina snap gage, the combinationiwit'h a then the object being 'gaged isrejected as substantially U-shaped frame providedwith being below theminimum allowable ditWoopposed heads havingplug-holes; of'a mensions. lo j V normally fixed adjustable measurin'g plug It will beseen from theforegoingythat mounted in one of the said lieads, and a my improved snapgage utilizes but one pair yielding measuring plugf V-mounted the ofmeasuring-plugs for;measuringmaximum other, one end vofthe 'yieldingplugbeing' and minimum dimensions;v wl'lereas, for used by directcontact withithe workffor if *merly, twopai-rs of plugs or theirequivagaging and its opposite end'lfbeing used for lents have been used.On account] of the measuring, ,p T p, "f a {yielding character of oneof; the plugs of 3.1,In a snap gage, the'coinbination with a improvedo-age," the same may be. 'ap-' substantially ru shaped'frameprovidedwith V.

' plied with perfect safety to a moving obtwo'opposed heads havingfplugholes,of1a.g"

ject; Without danger of' ;having,the gage normally fixed adjustablemeasuifiiig plug jammed and wrenchedout of the hand, of mounted in oneof; the said heads,Land a" V 1 1 the user Also onaccount of the yieldingyieldingmeasuringpiug mounted in the character of one of theplugs,=there .is;no other, the inner endl ofrthe yielding-plugba 7strain thrown on the frame of the gage ing used by direct contact withthejwork for tending to spread it and thusdestroy theingaging and itsouter end; beingfusjed. for

/ tegri'ty of the gage as ameasuring instrumeasuring. j l f c ment. Byutilizing the innenend of one-plug .7 4. In a snap gage,1the'combinati0n withja I f i d ph r r-rend for. measuring, substantiallyU-shapedframeprpvidedwithh 1 I secure-superior convenience, themeasuretwo opposed headsfhaving plugholes, ofia mejnt beingdeterminedeither visually or normallyfixed adjustable measurin'grplugtactually. v a H r Q mounted linone ofthe said heads, and' a My-improvedsnap gage, of course, is'not ,yielding"fmeasuringplug' mounted [jin thelimited to the use of plugs whose -inner or 1 other, 'theouter facebfthejhead inounting gaging ends are like those ,of the plugs 10 the saidyielding-plug being formed with-a and 19'. On the; contrary, thegaging'ends tolerance-step. .7 r i; of the plugs will be shaped inaccordance 5.. In a snap gage,thejconibination witha with the characterof the work to be gaged; substantially U-shaped frame provided with:'for instance, Fig. 11 shows a plug'lO havin two opposed heads havingplug-holes, of a its inner or' 'aging end formed witha relanormallyfixed adjustable measuring-plug tively large disk for .use in gagingspherical mounted inr'oneof the said heads'andhavinghole 9. A stop objects, while the yielding-plug19 of F igQ 12 pin 25 passing transverselyits outer. end formed .with a countersunk gagingendchisel-shaped as at29, to

screw-hole and slotted, a jam-screw located Specification in thepresence of two subscribifn the said screvlv-hiole, aniLdjIiIStiEII%'-SCI'GWK ing Witnesses. '01- en zwin Wit 1 t 1e outer em0' t 1e sai 1 jam-sa re? 3 seal for the said adjustin ALBERT MITCHELL 5screw, and a measuring-plug located in tie Witnesses:

plug-hole of the other head. ERIK PALMER,

In testimony whereof, I have signed this GEORGE D. SEYMOUR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

' Washington, D. C.

